网站死链接检查/指数基金怎么买才赚钱
配置NGINX负载均衡
在LB-M和LB-S上进行相同操作
安装NGINX
生产环境最好编译安装,这里直接装个epel源yum安装了
yum install epel-release -y
yum install nginx -y
配置NGINX
cat >> /etc/nginx/nginx.conf << "EOF"# 这里通过端口配置的是四层负载,也可以通过域名方式,配置七层负载stream {log_format main '$remote_addr $upstream_addr - [$time_local] $status $upstream_bytes_sent';access_log /var/log/nginx/upstream-access.log main;upstream www {ip_hash;server 192.168.2.101:8001;server 192.168.2.102:8001;}server {listen 8001;proxy_pass www;}
}
EOF
启动NGINX
systemctl restart nginx
systemctl enable nginx
配置Keeplived高可用
安装Keeplived
keeplived--yum安装
yum -y install keepalivedkeeplived--编译安装
tar -zxvf keepalived-1.2.19.tar.gz
./configure --prefix=/usr/local/keeplived
make && make install
做软连接
mkdir /etc/keepalived/
ln -s /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
ln -s /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
ln -s /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
配置Keeplived
LB-M
cat > /etc/keepalived/keepalived.conf << "EOF"
global_defs { notification_email { www.localhost.com} notification_email_from www.localhost.comrouter_id LB-M
} vrrp_script check_http {script "</dev/tcp/127.0.0.1/8001" #修改为自己需要监听的端口,理论上可以监听远程端口interval 2 #检查脚本的频率,单位（秒）weight -30 #端口检查失败,优先级减少30,weight的绝对值要大于两台priority的差值
}vrrp_instance VI_1 { state MASTER interface ens33 # 修改为实际网卡名virtual_router_id 51 # VRRP 路由 ID实例，每个实例是唯一的 priority 100 # 优先级，备服务器设置 90 advert_int 1 # 指定VRRP 心跳包通告间隔时间，默认1秒 authentication { auth_type PASS auth_pass 123456 } # VIPvirtual_ipaddress { 192.168.2.100/24} track_script {check_http}
}
EOF
LB-S
cat > /etc/keepalived/keepalived.conf << EOF
global_defs { notification_email { www.localhost.com } notification_email_from www.localhost.com router_id LB-S
}vrrp_script check_http {script "</dev/tcp/127.0.0.1/8001" #修改为自己需要监听的端口,理论上可以监听远程端口interval 2 #检查脚本的频率,单位（秒）weight -30 #端口检查失败,优先级减少30,weight的绝对值要大于两台priority的差值
}vrrp_instance VI_1 { state BACKUP interface ens33 # 修改为实际网卡名virtual_router_id 51 # VRRP 路由 ID实例，每个实例是唯一的 priority 90 # 优先级，备服务器设置 90 advert_int 1 # 指定VRRP 心跳包通告间隔时间，默认1秒 authentication { auth_type PASS auth_pass 123456 } # VIPvirtual_ipaddress { 192.168.2.100/24} track_script {check_http}
}
EOF
启动keepalived
systemctl restart keepalived
systemctl enable keepalived
两个重要的值: priority和weight
priority: 为默认权重值,一般master要大于back,权重值还和weight有关,当检测失败时候,priority会和weight相加或者相减,得到一个新的权重值
vrrp_script中weight:如果weight值为正: 切换机制为,当mater检测失败,master的priority值不变,back的权重值为priority+weight,master的权重小于back的权重,进行切换
如果weight值为负: 切换机制为,当master检测失败,master的权重值为priority-weight的值,back的权重值不变,master的权重值小于back,进行切换
总结: 一般来说weight的绝对值要小于master和back的priority的差值绝对值